Why is DFS Failing Over

On occasion the shared drives will get very, very slow - we have figured out that the reason is that the server is accessing the DFS share from a file-server in a remote site (across the WAN) as opposed to one in the same site.

We have a DFS share (\\domain\shared\Users) that is on three servers:
-Server1 (in SITE1)
-Server2 (in SITE2)
-Server3 (in SITE3)

The terminal servers are in SITE1 so they should use Server1 - and they do 95% of the time.
Every once in a while one or several servers will switch to using SITE2 even though Server1 is up and available. We do have site costing turned on and the Site-to-IP mapping is setup properly.

Is there any logging I can turn on in the clients to record when and why the DFS active server is switched?

I am not aware of any, but there can be problems if you have user profiles replicated among sites and multiple active DFS namespace links. It sounds like you are running Scenario 2A: DFS Namespaces is configured – multiple link target configuration.

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